我的程序有问题。它应该是通过堆栈识别回文的程序。一切都很好，唯一不起作用的是在功能完成后打印堆栈（原始和反向）。这是我的整个代码，问题在于案例 d 和 e：
#include <iostream>
using namespace std;
const int MAXSTACK = 21;
class stack {
private:
int stop;
char stk[MAXSTACK];
public:
stack();
~stack();
stack(const stack& s);
void push(const char c);
char pop();
char top(void);
int emptystack(void);
int fullstack(void);
void stack_print(void);
int stack::create(void);
};
stack::stack()
{
stop = 0;
}
stack::~stack() { }
stack::stack(const stack& s)
{
stop = s.stop;
strcpy(stk,s.stk);
}
void stack::push(const char c)
{
stk[stop++] = c;
}
char stack::pop()
{
return stop--;
}
char stack::top(void)
{
return stk[stop - 1];
}
int stack::emptystack(void)
{
return !stop;
}
int stack::fullstack(void)
{
return stop == MAXSTACK;
}
void stack::stack_print(void)
{
for (int i=0; i<stop; i++)
cout<<stk[i];
cout<<endl;
}
int stack::create(void)
{
return !stop;
}
char menu()
{
char volba;
cout<<"\n";
cout<<" **********.\n";
cout<<"\n";
cout<<" a ... make new containers\n";
cout<<" b ... delete content\n";
cout<<" c ... enter string\n";
cout<<" d ... print on screen first stack\n";
cout<<" e ... print on screen first stack\n";
cout<<" f ... is it palindrom\n";
cout<<" x ... exit\n";
cout<<"\n your choice : ";
cin >> volba;
return volba;
}
int main() {
char palindrome[MAXSTACK];
char volba;
stack original,reversed;
int stackitems = 0,i;
//cin.getline(palindrome,MAXSTACK);
do{
volba = menu();
switch (volba)
{
case'a':
{
original.create();
reversed.create();
cout<<"done'";
break;
}
case'b':
{
original.emptystack();
reversed.emptystack();
cout<<"empty";
break;
}
case'c':
{
cout<<"enter your string"<<endl;
cin.get();
//cin.get();
cin.getline(palindrome,MAXSTACK);
for(int o = 0; o < strlen(palindrome); o++)
if (isalpha(palindrome[o]))
{
original.push(tolower(palindrome[o]));
stackitems++;
}
original.stack_print();
break;
}
case'd':
{
original.~stack();
for(int g = 0; g < strlen(palindrome); g++)
original.push(tolower(palindrome[g]));
original.stack_print();
}
/*//cin.getline(palindrome,MAXSTACK);
for(int g = 0; g < strlen(palindrome); g++)
if (isalpha(palindrome[g]))
{
original.push(tolower(palindrome[g]));
stackitems++;
}
}
original.stack_print();*/
break;
/*{
cout<<"original: ";
original.stack_print();
break;
}*/
break;
case'e':
{
cout<<"reversed:"<<endl;
for( i = 0; i < stackitems; i++) {
reversed.push(original.top());
original.pop();
}
reversed.stack_print();
}
break;
case'f':
{
for( i = 0; i < stackitems / 2; i++) {
reversed.push(original.top());
original.pop();
}
if (stackitems % 2)
original.pop();
while (!original.emptystack()) {
if (original.top() != reversed.top()) break;
original.pop(); reversed.pop();
}
if (original.emptystack())
cout << "it is palindrom\n";
else
cout << "not palindrom\n";
break;
}
default:cout<<"!??!";
}
} while(volba!='x');
}